I have a Model 70 standard grade made in 1938 that's a little out of the ordinary, and not just because of the G&H side mount and 4x Kollmorgen Bearcub scope. This one started as a .30-o6, but at some point, in the 1950s I presume, some clever smith lined the original barrel and rechambered it for the hot new .222 Remington. The bolt face has been built up and machined (I think) for the new round. The amazing thing is that in the magazine well is a new magazine to handle the smaller cartridge. It came from a Virginia farm, and the owner must have spent at last as much as new Remington Model 722 to have it reworked. It functions as intended and shoots tight little groups.